Box-coupling for drilling-tools



(No Model.)

Mar. 29, 1887.

A. W. LEWIS.

BOX COUPLING FOR DRILLING TOOL No. 360,312. Patente d UNITED STATES PATENT (iEEicE.

ARTHUR \VILLIAM LEWIS, OF BRADFORD, PENNSYLVANIA.

BOX-COUPLING FOR DRILLING-TOOLS.

SPECIFICATION forming part of Letters Patent No. 360,312, dated March 29, 1887.

Application filed October 1-2, 1886. Serial No. 216,044.

To aZZ whom it may concern.-

Be it known that I, ARTHUR \VILLIAM LEWIS, of Bradford, in the county of McKean and State of Pennsylvania, haveinvented certain new and useful Improvements in the Manufacture of Box-Couplings for Drilling- Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in the manufacture of box-couplings for drillingtools; and it consists in, first, as a new article of manufacture, a box having the socket first forged in the end of a solid forging, and then screw-threaded, so as to receive the pin which screws into the box; second, the combination of a suitable means for holding and centering the solid forging with the hollow swage provided with a punch part at its center for forging the socket in the end of the forging, as will be more fully described hereinafter.

The object of my invention is to produce the box-coupling used in uniting two parts of a drilling-rod together by forging the socket in the end of a solid forging, thereby compressing the metal and making the box stronger and tougher, thus producing better boxes, and then screw-threading the socket thus formed more rapidly and cheaply than .by the old method.

Figure 1 is a vertical section of a solid box-forging ready to have the socket formed therein. Fig. 2 is a similar view of the box after the socket has been forged in and is ready to have the screw-thread cut therein. Fig. 3 is a vertical section of a swage by means of which the sockets are formed.

A represents a box-forging finished ready to have the socket formed therein, and which is an ordinary article of commerce. Heretofore a forging has been taken and first turned off on the outside to desired diameter, then placed in the steady-rest and a hole of suitable size and depth bored in its end, and then the hole or socket thus formed is screwthreaded. The work of making one of these forgings ready to have the socket formed therein is so great, owing to the amount of (No model.)

lathe-work, that a good workman can only make three or four a day. In making boxes in this-manner many of them show seams on the inside in being finished in the lathe, and often have to be thrown away after a large amount of work has been done, owing to flaws which could not be discovered sooner.

In making a box-forging according to my method a hot billet of iron of proper dimensions is placed on the lower hammer-die and centered in position under the hollow swage B, provided with the punch part 0, by means of the ring, plate, or centering device D, and then the centering device is removed, and the upper hammer-die is allowed to descend upon the swage B any desired number of times. As the punch part forges the socket in the end of the forging, the hollow swage sinks down over the end of the forging, compressing and toughening the metal and finishing the forging on its outside as far down as the swage reaches, a so leaving only two inches on the outside (the place for the steady-rest) to be turned. The socket formed by the punch corresponds to the shape it is to have when finished, leaving only the screwthread to be cut to have a finished box. Thus it will be seen that instead of furnishing solid box-forgings, I furnish, as new articles of commerce, boxforgings having sockets forged in them ready for the screw-threads, and in which the metal has been compressed and made stronger.

By my method of making the forgings better boxes can be produced more rapidly and cheaply than by the present process.

Having thus described my invention, I claim- 1. As a new article of manufacture, a boxforging having a forged socket in its end ready to receive the screw-thread, substantially as shown.

2. The combination of the hollow swage provided with the punch part 0 with suitable means for centering and holding, the forging, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ARTHUR \VILLIAM LEWIS.

XVitnesses:

EDWARD M. SWEENEY, A. O. HAWKINS. 

